spec-js/subjects/ReplaySubject-spec.js
"use strict";
var chai_1 = require('chai');
var Rx = require('../../dist/cjs/Rx');
var ReplaySubject = Rx.ReplaySubject;
var Observable = Rx.Observable;
/** @test {ReplaySubject} */
describe('ReplaySubject', function () {
it('should extend Subject', function () {
var subject = new ReplaySubject();
chai_1.expect(subject).to.be.instanceof(Rx.Subject);
});
it('should add the observer before running subscription code', function () {
var subject = new ReplaySubject();
subject.next(1);
var results = [];
subject.subscribe(function (value) {
results.push(value);
if (value < 3) {
subject.next(value + 1);
}
});
chai_1.expect(results).to.deep.equal([1, 2, 3]);
});
it('should replay values upon subscription', function (done) {
var subject = new ReplaySubject();
var expects = [1, 2, 3];
var i = 0;
subject.next(1);
subject.next(2);
subject.next(3);
subject.subscribe(function (x) {
chai_1.expect(x).to.equal(expects[i++]);
if (i === 3) {
subject.complete();
}
}, function (err) {
done(new Error('should not be called'));
}, function () {
done();
});
});
it('should replay values and complete', function (done) {
var subject = new ReplaySubject();
var expects = [1, 2, 3];
var i = 0;
subject.next(1);
subject.next(2);
subject.next(3);
subject.complete();
subject.subscribe(function (x) {
chai_1.expect(x).to.equal(expects[i++]);
}, null, done);
});
it('should replay values and error', function (done) {
var subject = new ReplaySubject();
var expects = [1, 2, 3];
var i = 0;
subject.next(1);
subject.next(2);
subject.next(3);
subject.error('fooey');
subject.subscribe(function (x) {
chai_1.expect(x).to.equal(expects[i++]);
}, function (err) {
chai_1.expect(err).to.equal('fooey');
done();
});
});
it('should only replay values within its buffer size', function (done) {
var subject = new ReplaySubject(2);
var expects = [2, 3];
var i = 0;
subject.next(1);
subject.next(2);
subject.next(3);
subject.subscribe(function (x) {
chai_1.expect(x).to.equal(expects[i++]);
if (i === 2) {
subject.complete();
}
}, function (err) {
done(new Error('should not be called'));
}, function () {
done();
});
});
describe('with bufferSize=2', function () {
it('should replay 2 previous values when subscribed', function () {
var replaySubject = new ReplaySubject(2);
function feedNextIntoSubject(x) { replaySubject.next(x); }
function feedErrorIntoSubject(err) { replaySubject.error(err); }
function feedCompleteIntoSubject() { replaySubject.complete(); }
var sourceTemplate = '-1-2-3----4------5-6---7--8----9--|';
var subscriber1 = hot(' (a|) ').mergeMapTo(replaySubject);
var unsub1 = ' ! ';
var expected1 = ' (23)4------5-6-- ';
var subscriber2 = hot(' (b|) ').mergeMapTo(replaySubject);
var unsub2 = ' ! ';
var expected2 = ' (34)-5-6---7-- ';
var subscriber3 = hot(' (c|) ').mergeMapTo(replaySubject);
var expected3 = ' (78)9--|';
expectObservable(hot(sourceTemplate).do(feedNextIntoSubject, feedErrorIntoSubject, feedCompleteIntoSubject)).toBe(sourceTemplate);
expectObservable(subscriber1, unsub1).toBe(expected1);
expectObservable(subscriber2, unsub2).toBe(expected2);
expectObservable(subscriber3).toBe(expected3);
});
it('should replay 2 last values for when subscribed after completed', function () {
var replaySubject = new ReplaySubject(2);
function feedNextIntoSubject(x) { replaySubject.next(x); }
function feedErrorIntoSubject(err) { replaySubject.error(err); }
function feedCompleteIntoSubject() { replaySubject.complete(); }
var sourceTemplate = '-1-2-3--4--|';
var subscriber1 = hot(' (a|) ').mergeMapTo(replaySubject);
var expected1 = ' (34|)';
expectObservable(hot(sourceTemplate).do(feedNextIntoSubject, feedErrorIntoSubject, feedCompleteIntoSubject)).toBe(sourceTemplate);
expectObservable(subscriber1).toBe(expected1);
});
it('should handle subscribers that arrive and leave at different times, ' +
'subject does not complete', function () {
var subject = new ReplaySubject(2);
var results1 = [];
var results2 = [];
var results3 = [];
subject.next(1);
subject.next(2);
subject.next(3);
subject.next(4);
var subscription1 = subject.subscribe(function (x) { results1.push(x); }, function (err) { results1.push('E'); }, function () { results1.push('C'); });
subject.next(5);
var subscription2 = subject.subscribe(function (x) { results2.push(x); }, function (err) { results2.push('E'); }, function () { results2.push('C'); });
subject.next(6);
subject.next(7);
subscription1.unsubscribe();
subject.next(8);
subscription2.unsubscribe();
subject.next(9);
subject.next(10);
var subscription3 = subject.subscribe(function (x) { results3.push(x); }, function (err) { results3.push('E'); }, function () { results3.push('C'); });
subject.next(11);
subscription3.unsubscribe();
chai_1.expect(results1).to.deep.equal([3, 4, 5, 6, 7]);
chai_1.expect(results2).to.deep.equal([4, 5, 6, 7, 8]);
chai_1.expect(results3).to.deep.equal([9, 10, 11]);
subject.complete();
});
});
describe('with windowTime=40', function () {
it('should replay previous values since 40 time units ago when subscribed', function () {
var replaySubject = new ReplaySubject(Number.POSITIVE_INFINITY, 40, rxTestScheduler);
function feedNextIntoSubject(x) { replaySubject.next(x); }
function feedErrorIntoSubject(err) { replaySubject.error(err); }
function feedCompleteIntoSubject() { replaySubject.complete(); }
var sourceTemplate = '-1-2-3----4------5-6----7-8----9--|';
var subscriber1 = hot(' (a|) ').mergeMapTo(replaySubject);
var unsub1 = ' ! ';
var expected1 = ' (23)4------5-6-- ';
var subscriber2 = hot(' (b|) ').mergeMapTo(replaySubject);
var unsub2 = ' ! ';
var expected2 = ' 4----5-6----7- ';
var subscriber3 = hot(' (c|) ').mergeMapTo(replaySubject);
var expected3 = ' (78)9--|';
expectObservable(hot(sourceTemplate).do(feedNextIntoSubject, feedErrorIntoSubject, feedCompleteIntoSubject)).toBe(sourceTemplate);
expectObservable(subscriber1, unsub1).toBe(expected1);
expectObservable(subscriber2, unsub2).toBe(expected2);
expectObservable(subscriber3).toBe(expected3);
});
it('should replay last values since 40 time units ago when subscribed', function () {
var replaySubject = new ReplaySubject(Number.POSITIVE_INFINITY, 40, rxTestScheduler);
function feedNextIntoSubject(x) { replaySubject.next(x); }
function feedErrorIntoSubject(err) { replaySubject.error(err); }
function feedCompleteIntoSubject() { replaySubject.complete(); }
var sourceTemplate = '-1-2-3----4|';
var subscriber1 = hot(' (a|)').mergeMapTo(replaySubject);
var expected1 = ' (4|)';
expectObservable(hot(sourceTemplate).do(feedNextIntoSubject, feedErrorIntoSubject, feedCompleteIntoSubject)).toBe(sourceTemplate);
expectObservable(subscriber1).toBe(expected1);
});
});
it('should be an Observer which can be given to Observable.subscribe', function () {
var source = Observable.of(1, 2, 3, 4, 5);
var subject = new ReplaySubject(3);
var results = [];
subject.subscribe(function (x) { return results.push(x); }, null, function () { return results.push('done'); });
source.subscribe(subject);
chai_1.expect(results).to.deep.equal([1, 2, 3, 4, 5, 'done']);
results = [];
subject.subscribe(function (x) { return results.push(x); }, null, function () { return results.push('done'); });
chai_1.expect(results).to.deep.equal([3, 4, 5, 'done']);
});
});
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